Air flow generator



FIG. 1 is a perspective view;

FIG. 2 is a front view;

FIG. 3 is a rear view;

FIG. 4 is a left side elevational view;

FIG. 5 is a right side elevational view;

FIG. 6 is a top elevational view; and,

FIG. 7 is a bottom elevational view. 

The ornamental design for an air flow generator, as shown and described. 